WO2012014368A1 - Contact mechanism and electromagnetic contactor using same - Google Patents
Contact mechanism and electromagnetic contactor using same Download PDFInfo
- Publication number
- WO2012014368A1 WO2012014368A1 PCT/JP2011/003376 JP2011003376W WO2012014368A1 WO 2012014368 A1 WO2012014368 A1 WO 2012014368A1 JP 2011003376 W JP2011003376 W JP 2011003376W WO 2012014368 A1 WO2012014368 A1 WO 2012014368A1
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- Prior art keywords
- contact
- conductive plate
- movable
- portions
- movable contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/14—Terminal arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
- H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H45/00—Details of relays
- H01H45/14—Terminal arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
- H01H50/546—Contact arrangements for contactors having bridging contacts
Definitions
- the present invention relates to a contact mechanism including a fixed contact and a movable contact inserted in a current path and an electromagnetic contactor using the contact mechanism, and to an electromagnetic repulsive force that separates the movable contact from the fixed contact during energization. It is designed to generate a Lorentz force to resist.
- a contact mechanism that opens and closes a current path as a fixed contact that is applied to a switch that generates an arc when a current is interrupted, such as a circuit breaker or an electromagnetic contactor, the U-shaped fixed contact is viewed from the side.
- the fixed contact is formed in the folded part, and the movable contact of the movable contact is arranged on the fixed contact so that the movable contact can be contacted / separated, and the electromagnetic repulsive force acting on the movable contact when a large current is interrupted is increased.
- a switch in which the opening speed is increased to rapidly stretch the arc see, for example, Patent Document 1).
- a contactor structure of an electromagnetic contactor that drives an arc by a magnetic field generated by a flowing current in a similar configuration has been proposed (see, for example, Patent Document 2).
- JP 2001-210170 A Japanese Patent Laid-Open No. 4-123719
- an electromagnetic contactor that constitutes a circuit in combination with a fuse or a circuit breaker needs to prevent the movable contact from being opened by electromagnetic repulsion when energizing a large current that flows during a short circuit.
- the spring force of the contact spring that secures the contact pressure of the movable contact with the fixed contact is increased.
- the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and suppresses the electromagnetic repulsive force that opens the movable contact when energized without increasing the overall configuration. It is an object of the present invention to provide a contact mechanism that can be used and an electromagnetic contactor using the contact mechanism.
- a first aspect of the contact mechanism according to the present invention is a contact mechanism having a fixed contact and a movable contact inserted in an energization path.
- the contact mechanism is configured to increase the Lorentz force against the electromagnetic repulsive force in the opening direction generated between the fixed contact and the movable contact when energized, by forming at least one of the fixed contact and the movable contact. It is characterized by that.
- the electromagnetic repulsion force in the opening direction generated between the fixed contact and the movable contact when energized with the shape of at least one of the fixed contact and the movable contact being, for example, L-shaped or U-shaped. Therefore, the opening of the movable contact when a large current is applied can be suppressed.
- the movable contact is supported by the movable part, and includes a conductive plate having contact parts on both end sides on one side of the front and back.
- the contact mechanism includes a pair of fixed contact portions where the fixed contact faces the contact portion of the conductive plate, and both ends of the conductive plate in parallel with the conductive plate, supporting the pair of fixed contact portions. L formed by a first conductive plate portion that extends further outward and a second conductive plate portion that extends from the outer end portion of the first conductive plate portion through the outside of the end portion of the conductive plate. It has a character-shaped conductive plate portion.
- the L-shaped conductive portion is formed by the first conductive plate portion and the second conductive plate portion on the fixed contact, with respect to the movable contact formed by the conductive plate, and the second when energized. From the relationship between the magnetic flux formed by the conductive plate portion and the current flowing through the first conductive plate portion, the movable contact member is resisted against the electromagnetic repulsion force in the opening direction that occurs during energization between the fixed contact member and the movable contact member. Generates a large Lorentz force in the direction of contact with the stationary contact.
- the fixed contact has a third conductive plate portion extending inward from the end of the second conductive plate portion in parallel to the conductive plate. It is characterized by having a U-shape. According to this configuration, currents in opposite directions flow through the first and third conductive portions, and the movable contact is fixed between the conductive plate of the movable contact and the third conductive plate of the fixed contact. An electromagnetic repulsive force can be generated in the direction of contact with the contact.
- the movable contact includes a conductive plate portion supported by the movable portion, U-shaped folded portions formed at both ends of the conductive plate portion, And a contact portion formed on a surface of the U-shaped folded portion facing the conductive plate portion.
- the said fixed contact is a pair of 1st electroconductive board part which formed the contact part which contacts the contact part of the said movable contact arranged in the said U-shaped folding
- the U-shaped folded portion is formed on the movable contact side, and the conductive plate portion of the movable contact and the first conductive of the fixed contact are utilized using the current path in the U-shaped folded portion.
- An electromagnetic repulsive force is generated between the plate portion and the movable contact in the direction of bringing the movable contact into contact with the fixed contact.
- the first aspect of the electromagnetic contactor according to the present invention includes the contact mechanism structure according to any one of the first to fourth aspects, and the movable contact is coupled to the movable iron core of the operation electromagnet.
- the fixed contact is connected to an external connection terminal.
- the spring of the contact spring that makes the movable contact contact the fixed contact by generating a Lorentz force against the electromagnetic repulsion force that opens the gap between the movable contact and the fixed contact when the electromagnetic contactor is energized.
- the power can be reduced.
- the thrust of the electromagnet that drives the movable contact can also be reduced, and a small electromagnetic contactor can be provided.
- an electromagnetic repulsion force in the opening direction generated in the stator contact and the movable contact when a large current is supplied to the contact mechanism having the fixed contact and the movable contact inserted in the energization path is resisted.
- Lorentz force can be generated. For this reason, it is possible to reliably prevent the opening of the movable contact when energizing a large current without using a mechanical pressing force.
- FIG. 1 is a main body case made of, for example, a synthetic resin.
- the main body case 1 has a two-part structure of an upper case 1a and a lower case 1b.
- the upper case 1a is internally provided with a contact mechanism CM.
- the contact mechanism CM includes a fixed contact 2 fixedly disposed on the upper case 1a, and a movable contact 3 disposed so as to be able to contact with and separate from the fixed contact 2.
- an operation electromagnet 4 for driving the movable contact 3 is disposed.
- the electromagnet 4 for operation has a stationary iron core 5 formed of an E-shaped laminated steel plate and a movable iron core 6 formed of an E-shaped laminated steel plate facing each other.
- An electromagnetic coil 8 supplied with a single-phase alternating current wound around a coil holder 7 is fixed to the central leg 5a of the fixed iron core 5.
- a return spring 9 is provided between the upper surface of the coil holder 7 and the root of the central leg 6 a of the movable iron core 6 to urge the movable iron core 6 in a direction away from the fixed iron core 5.
- a shading coil 10 is embedded in the upper end surface of the outer leg portion of the fixed iron core 5.
- the shading coil 10 can suppress fluctuations in electromagnetic attraction, noise, and vibration due to changes in alternating magnetic flux in the single-phase AC electromagnet.
- a contact holder 11 is connected to the upper end of the movable iron core 6. The contact holder 11 is pressed downwardly into an insertion hole 11a formed on the upper end side thereof in a direction perpendicular to the axis so that the movable contact 3 obtains a predetermined contact pressure against the fixed contact 2 by the contact spring 12. Being held.
- the movable contact 3 is composed of an elongated bar-shaped conductive plate 3a whose central portion is pressed by a contact spring 12, and a movable contact portion 3b is formed on the lower surface of both ends of the conductive plate 3a. , 3c are formed.
- the fixed contact 2 supports a pair of fixed contact portions 2a and 2b opposed to the movable contact portions 3b and 3c of the movable contact 3 from the lower side, and a conductive plate 3a.
- the first conductive plate portions 2c and 2d facing outward in parallel and the upper ends of the first conductive plate portions 2c and 2d from the outer end portion outside the conductive plate 3a through the outside of the end portions of the conductive plate 3a L-shaped conductive plate portions 2g and 2h formed by second conductive plate portions 2e and 2f extending in the length direction. And as shown in FIG. 1, it connects with the external connection terminals 2i and 2j extended and fixed to the outer side of the upper case 1a at the upper end of these L-shaped electroconductive board parts 2g and 2h.
- the movable contact 3 In the state where the movable iron core 6 is at the current interruption position, the movable contact 3 is in contact with the bottom of the insertion hole 11a of the contact holder 11 by the contact spring 12 as shown in FIG. In this state, the movable contact portions 3b and 3c formed on both ends of the conductive plate 3a of the movable contact 3 are spaced upward from the fixed contact portions 2a and 2b of the fixed contact 2, and the contact mechanism CM is opened. It is in a state.
- a large current of, for example, several tens of kA inputted from the external connection terminal 2i of the fixed contact 2 connected to a DC power source (not shown) is applied to the second conductive plate portion 2e, 1 is supplied to the movable contact portion 3b of the movable contact 3 through the conductive plate portion 2c and the fixed contact portion 2a.
- the large current supplied to the movable contact portion 3b is supplied to the fixed contact portion 2b through the conductive plate 3a and the movable contact portion 3c.
- the large current supplied to the fixed contact portion 2b is supplied to the first conductive plate portion 2d, the second conductive plate portion 2f, and the external connection terminal 2j to form an energization path that is supplied to an external load.
- the fixed contact 2 has L-shaped conductive plate portions 2g and 2h formed by the first conductive plate portions 2c and 2d and the second conductive plate portions 2e and 2f.
- a magnetic field shown in FIG. 2D is formed for the current flowing through the movable contact 3.
- the machining of the stationary contact 2 can be easily performed, and the electromagnetic repulsive force in the opening direction is separately provided. Since the member which generate
- a Lorentz force is generated against the electromagnetic repulsion force in the opening direction generated with respect to the stationary contact and the movable contact on the back side of the movable contact. That is, in the second embodiment, as shown in FIG. 3, the second conductive plate in the L-shaped conductive plate portions 2g and 2h of the stationary contact 2 in the configuration of FIG. 2 in the first embodiment described above. The portions 2e and 2f are bent so as to cover the upper end side of the end portion of the conductive plate 3a of the movable contact 3 to form third conductive plate portions 2m and 2n parallel to the conductive plate 3a to form a U-shaped conductive portion. Except that 2o and 2p are formed, the configuration is the same as that of the first embodiment described above.
- a large current of about several tens kA, for example, input from the external connection terminal 2i of the fixed contact 2 connected to the DC power source (not shown) is third.
- the conductive plate portion 2m, the second conductive plate portion 2e, the first conductive plate portion 2c, and the fixed contact portion 2a are supplied to the movable contact portion 3b of the movable contact 3.
- the large current supplied to the movable contact portion 3b is supplied to the fixed contact portion 2b through the conductive plate 3a and the movable contact portion 3c.
- the large current supplied to the fixed contact portion 2b is supplied to the first conductive plate portion 2d, the second conductive plate portion 2f, the third conductive plate portion 2n, and the external connection terminal 2j, and is applied to an external load.
- a supplied energization path is formed.
- an electromagnetic repulsive force is generated between the fixed contact portions 2a and 2b of the fixed contact 2 and the movable contact portions 3b and 3c of the movable contact 3 in a direction to open the movable contact portions 3b and 3c.
- the fixed contact 2 has a U-shaped conductive plate by the first conductive plate portions 2c and 2d, the second conductive plate portions 2e and 2f, and the third conductive plate portions 2m and 2n. Since the portions 2o and 2p are formed, a current in the reverse direction flows between the third conductive plate portions 2m and 2n of the fixed contact 2 and the conductive plate 3a of the movable contact 3 facing the third conductive plate portions 2m and 2n.
- the conductive plate 3a of the movable contact 3 is defined by the Fleming left-hand rule from the relationship between the magnetic field formed by the third conductive plate portions 2m and 2n of the fixed contact 2 and the current flowing through the conductive plate 3a of the movable contact 3.
- a Lorentz force that presses against the fixed contact portions 2 a and 2 b of the fixed contact 2 can be generated. This Lorentz force can resist the electromagnetic repulsion force in the opening direction generated between the fixed contact portions 2a and 2b of the fixed contact 2 and the movable contact portions 3b and 3c of the movable contact 3. It is possible to prevent the three movable contact portions 3b and 3c from opening.
- the electromagnetic repulsion in the opening direction generated between the fixed contact 2 and the movable contact 3 with a simple configuration in which the U-shaped conductive plate portions 2o and 2p are formed on the fixed contact 2 also.
- a Lorentz force against the force can be generated, and the same effect as in the first embodiment described above can be obtained.
- a U-shaped folded portion is formed on the movable contact, contrary to the second embodiment described above. That is, in the third embodiment, as shown in FIGS. 4A to 4C, the first conductive plate portions 3d and 3e extending upward from both ends of the conductive plate 3a of the movable contact 3 are provided. And the second conductive plate portions 3f and 3g extending inward from the upper ends of the first conductive plate portions 3d and 3e form U-shaped folded portions 3h and 3i that are folded back to the upper side of the conductive plate 3a.
- Movable contact portions 3j and 3k are formed on the lower surfaces of the distal ends of the second conductive plate portions 3f and 3g of the U-shaped folded portions 3h and 3i.
- the fixed contact 2 faces the conductive plate 3a forming the U-shaped folded portions 3h, 3i of the movable contact 3 and the second conductive plate portions 3f, 3g in the opened state of the contact mechanism CM.
- Inwardly extending fourth conductive plate portions 2q, 2r and inner ends of the U-shaped folded portions 3h, 3i of the movable contact 3 upward from the inner ends of the fourth conductive plate portions 2q, 2r L-shaped conductive plate portions 2u and 2v are formed by fifth conductive plate portions 2s and 2t extending upward through the inside of the portion.
- the fixed contact portions 2w and 2x are formed at positions facing the movable contact portions 3j and 3k of the movable contact 3 of the fourth conductive plate portions 2q and 2r.
- the contact mechanism CM as shown in FIG. 4B, the conductive plate 3 a of the movable contact 3 is in contact with the bottom of the insertion hole 11 a by the contact spring 12.
- the fourth conductive plate portions 2q and 2r of the fixed contact 2 are located at the intermediate portion between the conductive plate 3a and the second conductive plate portions 3f and 3g constituting the U-shaped folded portions 3h and 3i. 2w and 2x are spaced apart from the movable contact portions 3j and 3k and are open.
- the contact holder 11 When the movable iron core 6 is attracted by the fixed iron core 5 against the return spring 9 by applying a single-phase alternating current to the electromagnetic coil 8 of the operation electromagnet 4 from the opened state of the contact mechanism CM, the contact holder 11 is moved. Descend. For this reason, in the contact mechanism CM, as shown in FIG. 4C, the movable contact portions 3 j and 3 k of the movable contact 3 are in a closed state in which they are in contact with the fixed contact portions 2 w and 2 x of the fixed contact 2.
- a large current of about several tens of kA, for example, input from the external connection terminal 2i of the fixed contact 2 connected to a DC power source (not shown) is the fifth.
- the large current supplied to the movable contact portion 3j includes the second conductive plate portion 3f, the first conductive plate portion 3d, the conductive plate 3a, the first conductive plate portion 3e, the second conductive plate portion 3g, and the movable contact point. It is supplied to the fixed contact portion 2x through the portion 3k.
- the large current supplied to the fixed contact portion 2x forms an energization path that is supplied to an external load through the fourth conductive plate portion 2r, the fifth conductive plate portion 2t, and the external connection terminal 2j.
- the conductive plate 3a is moved by the current flowing through the conductive plate 3a of the movable contact 3 and the magnetic field formed by the fourth conductive plate portions 2q and 2r of the fixed contact 2.
- Lorentz force that presses the movable contact portions 3j and 3k of the contact 3 against the fixed contact portions 2w and 2x of the fixed contact 2 can be generated.
- this Lorentz force it becomes possible to resist the electromagnetic repulsion force in the opening direction generated between the fixed contact portions 2w and 2x of the fixed contact 2 and the movable contact portions 3j and 3k of the movable contact 3, and a large current It is possible to prevent the movable contact portions 3j and 3k of the movable contact 3 from opening when energized.
- the L-shaped conductive plate portions 2u and 2v are formed on the fixed contact 2, the L-shaped upper side of the second conductive plate portions 3f and 3g of the movable contact 3 is formed.
- a magnetic flux strengthening portion is formed by the fifth conductive plate portions 2s and 2t of the conductive plate portions 2u and 2v.
- both the fixed contact and the movable contact are formed in a flat plate shape to generate a Lorentz force that resists the electromagnetic repulsion force in the opening direction. That is, in the fourth embodiment, as shown in FIGS. 5A to 5D, the fixed contact 2 and the movable contact 3 constituting the contact mechanism CM are both formed in a flat plate shape.
- the fixed contact 2 has flat plate conductors 21a and 21b that are rectangular when viewed from a plane arranged at a predetermined distance from each other.
- These flat conductors 21a and 21b are formed in line symmetry, and U-shaped grooves 22a and 22b whose open end faces are on the inner end face side at the positions facing the longitudinal ends of the movable contactor 3 are on the front and back sides.
- Fixed contact portions 24a and 24b are formed on the surfaces of the plate portions 23a and 23b that are formed so as to penetrate and are surrounded by the U-shaped grooves 22a and 22b.
- the movable contact 3 has rectangular through holes 31a and 31b separated from each other at positions facing the plate portions 23a and 23b surrounded by the U-shaped grooves 22a and 22b in the flat conductors 21a and 21b of the fixed contact 2. Is formed. Movable contact portions 32a and 32b are formed on the lower surface of the fixed contact 2 opposite to the fixed contact portions 24a and 24b at the outer end portions of the through holes 31a and 31b.
- the movable iron core 6 when the electromagnetic coil 8 of the operation electromagnet 4 is in a non-energized state, the movable iron core 6 is moved to the upper position by the return spring 9 as in the first to third embodiments described above. It is in. For this reason, since the contact holder 11 is in the upper position as shown in FIG. 5B, the flat conductors 21a and 21b of the fixed contact 2 and the movable contact 3 are separated from each other, and the fixed contact portions 24a of both of them are separated. 24b and the movable contact portions 32a and 32b are separated from each other, and the contact mechanism CM is in an open state.
- a large current from, for example, a DC power source input from the external connection terminal 2i is input to the flat conductor 21a on the left end side, and is fixed to the plate portion 23a surrounded by the U-shaped groove 22a. Since the portion 24a is formed, a large current input to the flat conductor 21a enters the plate portion 23a through the side plate portions 25a and 25b on both side surfaces of the U-shaped groove 22a and is movable from the fixed contact portion 24a. It is supplied to the movable contact portion 32 a of the contact 3.
- the large current supplied to the movable contact portion 32a passes through the side plate portions 33a and 33b on both side surfaces of the through hole 31a, passes through the side plate portions 34a and 34b on both side surfaces of the through hole 31b, and then from the movable contact portion 32b. It is supplied to the fixed contact portion 24b of the flat conductor 21b.
- the large current supplied to the fixed contact portion 24b passes through the side plate portions 26a and 26b on both sides of the U-shaped groove 22b from the plate portion 23b, and passes through the external connection terminal 2j from the right end side of the flat conductor 21b. To be supplied.
- This Lorentz force can suppress the electromagnetic repulsion force in the opening direction generated between the fixed contact portions 24a and 24b and the movable contact portions 32a and 32b, and can prevent the opening of the movable contact 3 as described above.
- the same effects as those of the first to third embodiments can be obtained.
- the case where the operation electromagnet 4 is AC-excited has been described.
- an operation electromagnet that performs DC excitation may be applied, and the drive mechanism of the movable contact 3 has the above-described configuration.
- the driving mechanism is not limited, and an arbitrarily configured driving mechanism can be applied.
- the case where the contact mechanism CM of the present invention is applied to an electromagnetic contactor has been described.
- the present invention is not limited to this and can be applied to any device such as a switch. .
- At least one of the fixed contact and the movable contact is shaped so as to generate a Lorentz force that resists the electromagnetic repulsion force in the opening direction generated in the stator contact and the movable contact when a large current is applied.
- the contact mechanism which can suppress the opening at the time of current supply, and the electromagnetic contactor using this can be provided.
Abstract
Description
また、同様の構成において流れる電流により発生する磁界によりアークを駆動させる電磁接触器の接触子構造が提案されている(例えば、特許文献2参照)。 Conventionally, as a contact mechanism that opens and closes a current path, as a fixed contact that is applied to a switch that generates an arc when a current is interrupted, such as a circuit breaker or an electromagnetic contactor, the U-shaped fixed contact is viewed from the side. The fixed contact is formed in the folded part, and the movable contact of the movable contact is arranged on the fixed contact so that the movable contact can be contacted / separated, and the electromagnetic repulsive force acting on the movable contact when a large current is interrupted is increased. Has proposed a switch in which the opening speed is increased to rapidly stretch the arc (see, for example, Patent Document 1).
Further, a contactor structure of an electromagnetic contactor that drives an arc by a magnetic field generated by a flowing current in a similar configuration has been proposed (see, for example, Patent Document 2).
そこで、本発明は、上記従来例の未解決の課題に着目してなされたものであり、全体の構成を大型化することなく通電時に可動接触子を開極させる電磁反発力を抑制することができる接点機構及びこれを使用した電磁接触器を提供することを目的としている。 When the contact pressure by the contact spring is increased in this way, it is necessary to increase the thrust generated by the electromagnet that drives the movable contact, and the overall configuration increases. Alternatively, it is necessary to combine with a fuse or a circuit breaker that has a higher current limiting effect and an excellent breaking performance.
Therefore, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and suppresses the electromagnetic repulsive force that opens the movable contact when energized without increasing the overall configuration. It is an object of the present invention to provide a contact mechanism that can be used and an electromagnetic contactor using the contact mechanism.
この構成によると、第1及び第3の導電部で逆方向の電流が流れることになり、可動接触子の導電板と固定接触子の第3の導電板部との間に可動接触子を固定接触子に接触させる方向の電磁反発力を発生することができる。 In a third aspect of the contact mechanism according to the present invention, the fixed contact has a third conductive plate portion extending inward from the end of the second conductive plate portion in parallel to the conductive plate. It is characterized by having a U-shape.
According to this configuration, currents in opposite directions flow through the first and third conductive portions, and the movable contact is fixed between the conductive plate of the movable contact and the third conductive plate of the fixed contact. An electromagnetic repulsive force can be generated in the direction of contact with the contact.
この構成によると、電磁接触器の通電時に可動接触子及び固定接触子間を開極させる電磁反発力に抗するローレンツ力を発生させて、可動接触子を固定接触子に接触させる接触スプリングのバネ力を小さくすることができる。これに応じて、可動接触子を駆動する電磁石の推力も小さくすることができ、小型な電磁接触器を提供することができる。 The first aspect of the electromagnetic contactor according to the present invention includes the contact mechanism structure according to any one of the first to fourth aspects, and the movable contact is coupled to the movable iron core of the operation electromagnet. The fixed contact is connected to an external connection terminal.
According to this configuration, the spring of the contact spring that makes the movable contact contact the fixed contact by generating a Lorentz force against the electromagnetic repulsion force that opens the gap between the movable contact and the fixed contact when the electromagnetic contactor is energized. The power can be reduced. Accordingly, the thrust of the electromagnet that drives the movable contact can also be reduced, and a small electromagnetic contactor can be provided.
図1において、1は例えば合成樹脂製の本体ケースである。この本体ケース1は、上部ケース1aと下部ケース1bの2分割構造を有する。上部ケース1aには、接点機構CMが内装されている。この接点機構CMは、上部ケース1aに固定配置された固定接触子2と、この固定接触子2に接離自在に配設された可動接触子3とを備えている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, 1 is a main body case made of, for example, a synthetic resin. The main body case 1 has a two-part structure of an
固定鉄心5の中央脚部5aにはコイルホルダ7に巻装された単相交流が供給される電磁コイル8が固定されている。また、コイルホルダ7の上面と可動鉄心6の中央脚6aの付け根との間に可動鉄心6を固定鉄心5から離れる方向に付勢する復帰スプリング9が配設されている。 In the
An electromagnetic coil 8 supplied with a single-phase alternating current wound around a
そして、可動鉄心6の上端に接触子ホルダ11が連結されている。この接触子ホルダ11にはその上端側に軸直角方向に形成された挿通孔11aに、可動接触子3が接触スプリング12によって固定接触子2に対して所定の接触圧を得るように下方に押圧されて保持されている。 Further, a
A
一方、固定接触子2は、図2に拡大図示するように、可動接触子3の可動接点部3b,3cに下側から対向する一対の固定接点部2a,2bを支持して導電板3aと平行に外側に向かう第1の導電板部2c,2dと、この第1の導電板部2c,2dの導電板3aより外側となる外側端部から導電板3aの端部の外側を通って上方に延長する第2の導電板部2e,2fとで形成されたL字状導電板部2g,2hを備えている。そして、これらL字状導電板部2g,2hの上端に、図1に示すように、上部ケース1aの外側に延長して固定された外部接続端子2i,2jに連結されている。 As shown in an enlarged view in FIG. 2, the
On the other hand, as shown in an enlarged view in FIG. 2, the fixed
今、操作用電磁石4の電磁コイル8が非通電状態である状態では、固定鉄心5及び可動鉄心6間に電磁吸引力が生じることはなく、復帰スプリング9によって、可動鉄心6が固定鉄心5から上方に離れる方向に付勢され、この可動鉄心6の上端がストッパ13に当接することにより電流遮断位置に保持される。 Next, the operation of the first embodiment will be described.
Now, in a state where the electromagnetic coil 8 of the
しかしながら、固定接触子2は、図2に示すように、第1の導電板部2c,2d及び第2の導電板部2e,2fによってL字状導電板部2g,2hが形成されているので、上述した電流路が形成されることにより、可動接触子3を流れる電流に対し、図2(d)に示す磁界を形成する。このため、フレミングの左手の法則により、可動接触子3の導電板3aに可動接点部3b,3cを固定接点部2a,2b側に押し付ける開極方向の電磁反発力に抗するローレンツ力を作用させることができる。 At this time, an electromagnetic repulsive force is generated between the
However, as shown in FIG. 2, the fixed
この第2の実施形態では、可動接触子の背面側に固定接触子及び可動接触子に対して発生する開極方向の電磁反発力に抗するローレンツ力を発生させるようにしたものである。
すなわち、第2の実施形態では、図3に示すように、前述した第1の実施形態における図2の構成において、固定接触子2のL字状導電板部2g,2hにおける第2の導電板部2e,2fを可動接触子3の導電板3aの端部の上端側を覆うように折り曲げて、導電板3aと平行な第3の導電板部2m,2nを形成してU字状導電部2o,2pを形成したことを除いては前述した第1の実施形態と同様の構成を有する。 Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, a Lorentz force is generated against the electromagnetic repulsion force in the opening direction generated with respect to the stationary contact and the movable contact on the back side of the movable contact.
That is, in the second embodiment, as shown in FIG. 3, the second conductive plate in the L-shaped
このとき、固定接触子2の固定接点部2a,2b及び可動接触子3の可動接点部3b、3c間に可動接点部3b,3cを開極させる方向の電磁反発力が発生する。 When the contact mechanism CM is in the closed state in this way, for example, a large current of about several tens kA, for example, input from the external connection terminal 2i of the fixed
At this time, an electromagnetic repulsive force is generated between the
この第3の実施形態では、前述した第2の実施形態とは逆に可動接触子にU字状折り返し部を形成するようにしたものである。
すなわち、第3の実施形態では、図4(a)~図4(c)に示すように、可動接触子3の導電板3aの両端側から上方に延長する第1の導電板部3d,3eと、この第1の導電板部3d,3eの上端から内方に延長する第2の導電板部3f,3gとで、導電板3aの上方側に折り返すU字状折り返し部3h,3iが形成されている。これらU字状折り返し部3h,3iの第2の導電板部3f,3gにおける先端側の下面に可動接点部3j,3kが形成されている。 Next, a third embodiment of the present invention will be described with reference to FIG.
In the third embodiment, a U-shaped folded portion is formed on the movable contact, contrary to the second embodiment described above.
That is, in the third embodiment, as shown in FIGS. 4A to 4C, the first
しかしながら、可動接触子3は、図4に示すように、導電板3a、第1の導電板部3d,3e及び第2の導電板部3f,3gによってU字状折り返し部3h,3iが形成されているので、可動接触子3の導電板3aと固定接触子2の第4の導電板部2q,2rとに逆方向の電流が流れることになる。このため、図4(c)に示すように、可動接触子3の導電板3aに流れる電流と固定接触子2の第4の導電板部2q,2rが形成する磁界により、導電板3aに可動接触子3の可動接点部3j,3kを固定接触子2の固定接点部2w,2xに押し付けるローレンツ力を発生することができる。このローレンツ力によって、固定接触子2の固定接点部2w,2x及び可動接触子3の可動接点部3j,3k間に発生する開極方向の電磁反発力に抗することが可能となり、大電流の通電時に可動接触子3の可動接点部3j,3kが開極することを防止することができる。 At this time, an electromagnetic repulsive force is generated between the
However, in the
この第4の実施形態においては、固定接触子及び可動接触子をともに平板状に形成して開極方向の電磁反発力に抗するローレンツ力を発生させるようにしたものである。
すなわち、第4の実施形態では、図5(a)~(d)に示すように、接点機構CMを構成する固定接触子2及び可動接触子3をともに平板状に形成されている。固定接触子2は、互いに所定間隔を保って配設された平面から見て長方形状の平板導体21a,21bを有する。これら平板導体21a,21bは、線対称に形成されており、可動接触子3の長手方向端部に対向する位置に、開放端面が内方端面側となるU字状溝22a,22bが表裏に貫通して形成され、これらU字状溝22a及び22bで囲まれる板部23a,23bの可動接触子3との対向面に固定接点部24a,24bが形成されている。 Next, a fourth embodiment of the present invention will be described with reference to FIG.
In the fourth embodiment, both the fixed contact and the movable contact are formed in a flat plate shape to generate a Lorentz force that resists the electromagnetic repulsion force in the opening direction.
That is, in the fourth embodiment, as shown in FIGS. 5A to 5D, the fixed
この固定接点部24bに供給された大電流は、板部23bからU字状溝22bの両側面側の側板部26a,26bを通り、平板導体21bの右端側から外部接続端子2jを通って負荷に供給される。 The large current supplied to the
The large current supplied to the fixed
このため、可動接触子3の側板部33a,33b及び34a,34bにはフレミングの左手の法則によって下向きのローレンツ力が発生する。このローレンツ力によって固定接点部24a,24b及び可動接点部32a,32b間に発生する開極方向の電磁反発力を抑制することができ、可動接触子3の開極を防止することができ、前述した第1~第3の実施形態と同様の効果を得ることができる。 At this time, the direction of the current passing through the
For this reason, downward Lorentz force is generated in the
また、上記各実施形態においては、本発明の接点機構CMを電磁接触器に適用した場合について説明したが、これに限定されるものではなく、開閉器等の任意の機器に適用することができる。 In each of the above embodiments, the case where the
In each of the above embodiments, the case where the contact mechanism CM of the present invention is applied to an electromagnetic contactor has been described. However, the present invention is not limited to this and can be applied to any device such as a switch. .
Claims (5)
- 通電路に介挿された固定接触子及び可動接触子を有する接点機構であって、
前記固定接触子及び可動接触子の少なくとも一方の形状を、通電時に前記固定接触子及び前記可動接触子間に発生する開極方向の電磁反発力に抗するローレンツ力を発生する形状としたことを特徴とする接点機構。 A contact mechanism having a stationary contact and a movable contact inserted in a current path,
The shape of at least one of the fixed contact and the movable contact is a shape that generates a Lorentz force that resists an electromagnetic repulsion force in the opening direction generated between the fixed contact and the movable contact during energization. Characteristic contact mechanism. - 前記可動接触子は、可動部に支持され、表裏の一方の面における両端側にそれぞれ接点部を有する導電板を備え、
前記固定接触子は、前記導電板の接点部に対向する一対の固定接点部を支持してそれぞれ前記導電板と平行に当該導電板の両端より外側に向かう第1の導電板部と、該第1の導電板部の外方端部から前記導電板の端部の外側を通って延長する第2の導電板部とで形成されたL字状導電板部を備えている
ことを特徴とする請求項1に記載の接点機構。 The movable contact is supported by a movable portion, and includes a conductive plate having contact portions on both end sides on one side of the front and back sides,
The fixed contact supports a pair of fixed contact portions opposed to the contact portions of the conductive plate, and each of the fixed contact portions is parallel to the conductive plate and extends outward from both ends of the conductive plate. It comprises an L-shaped conductive plate portion formed by an outer end portion of one conductive plate portion and a second conductive plate portion extending through the outside of the end portion of the conductive plate. The contact mechanism according to claim 1. - 前記固定接触子は、前記第2の導電板部の端部から前記導電板と平行に内方に延長する第3の導電板部を有してU字状に構成されていることを特徴とする請求項2に記載の接点機構。 The fixed contact has a third conductive plate portion extending inward from the end portion of the second conductive plate portion in parallel with the conductive plate, and is configured in a U shape. The contact mechanism according to claim 2.
- 前記可動接触子は、可動部に支持される導電板部と、該導電板部の両端に形成されたU字状折り返し部と、該U字状折り返し部の前記導電板部との対向面に形成された接点部とを備え、
前記固定接触子は、前記U字状折り返し部内に前記導電板部と平行に配設された前記可動接触子の接点部と接触する接点部を形成した一対の第1の導電板部と、該一対の第1の導電板部の内側端からそれぞれ前記U字状折り返し部の端部の内側を通って延長する第2の導電板部とで構成されるL字状導電板部を備えている
ことを特徴とする請求項1に記載の接点機構。 The movable contact is formed on a conductive plate portion supported by the movable portion, a U-shaped folded portion formed at both ends of the conductive plate portion, and a surface of the U-shaped folded portion facing the conductive plate portion. A contact point formed,
The fixed contact has a pair of first conductive plate portions in which a contact portion that contacts a contact portion of the movable contact disposed in parallel with the conductive plate portion is formed in the U-shaped folded portion, An L-shaped conductive plate portion that includes a second conductive plate portion that extends from the inner ends of the pair of first conductive plate portions through the inside of the end portion of the U-shaped folded portion, respectively. The contact mechanism according to claim 1. - 前記請求項1乃至請求項4の何れか1項に記載の接点機構を備え、前記可動接触子が操作用電磁石の可動鉄心に連結され、前記固定接触子が外部接続端子に接続されていることを特徴とする電磁接触器。 The contact mechanism according to any one of claims 1 to 4, wherein the movable contact is connected to a movable iron core of an operation electromagnet, and the fixed contact is connected to an external connection terminal. An electromagnetic contactor characterized by.
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US13/640,612 US8816803B2 (en) | 2010-07-27 | 2011-06-14 | Contact mechanism and electromagnetic contactor using same |
CN201180018392.9A CN102844833B (en) | 2010-07-27 | 2011-06-14 | The electromagnetic contactor of contact mechanism and this contact mechanism of use |
EP11811975.9A EP2546853B1 (en) | 2010-07-27 | 2011-06-14 | Contact mechanism and electromagnetic contactor using same |
KR1020137004680A KR101750137B1 (en) | 2010-07-27 | 2011-06-14 | Contact mechanism and electromagnetic contactor using same |
US14/289,127 US8981883B2 (en) | 2010-07-27 | 2014-05-28 | Contact mechanism and electromagnetic contactor using same |
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CN102844833A (en) | 2012-12-26 |
EP2546853A1 (en) | 2013-01-16 |
US20130113580A1 (en) | 2013-05-09 |
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